udp port 69 (tftp) unreachable

Hi,

When I do tftp from my TFTP client (Target board running YAMON) it fails. 
The TFTP server is configured on a stand-alone PC running RH Linux 9.


Info. about the protocols on the Host PC:
---------------------------------

[root@localhost root]# lsof -c x -a -i
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
xinetd 1757 root 5u IPv4 2205 TCP localhost.localdomain:1025 (LISTEN)
xinetd 1757 root 6u IPv4 2208 UDP *:tftp



Captured using $ tcpdump -n (while tftp client was actively trying)
-----------------------
20:56:40.615815 arp who-has 4.42.102.5 tell 4.42.102.6
20:56:40.615890 arp reply 4.42.102.5 is-at 0:e0:98:9e:84:96
20:56:40.622048 4.42.102.6.1040 > 4.42.102.5.tftp: 20 RRQ "vmlinux.rec" (DF)
20:56:40.622112 4.42.102.5 > 4.42.102.6: icmp: 4.42.102.5 udp port tftp 
unreachable [tos 0xc0]
20:56:41.699926 4.42.102.6.1040 > 4.42.102.5.tftp: 20 RRQ "vmlinux.rec" (DF)
20:56:41.700006 4.42.102.5 > 4.42.102.6: icmp: 4.42.102.5 udp port tftp 
unreachable [tos 0xc0]

Please tell me why the PC host running tftp server is replying udp port tftp 
unreachable?

Could this be firewall issue? The RH linux 9 installation is new & its at 
home.

Both hosts.allow and hosts.deny files under /etc
are empty.

Please tell me what other issue this might be or a procedure to debug this 
further.

Thanks,
-Mike.

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